As the second link may didn't work here a new try:
http://tinyurl.com/379erd3
----- Original Message -----
From: Ralf Vandebergh
To: seesat-l@satobs.org
Cc: Ralf Vandebergh
Sent: Friday, June 25, 2010 3:14 PM
Subject: Soyuz orbital stage tumbling obs_additional data processing
subject: Soyuz orbital stage tumbling obs_additional data processing
____________________________________________________________________
Some additional measurements and analyses of the frames obtained of
the tumbling motion of the Soyuz TMA-19 Rocket orbital stage on June 17
provided quite interesting data.
Between long-axis view and short-axis view of the rocket appeared to
be a time between 1 and 2 seconds, probably no much longer then 1 second
but precise estimation is not easy to give, as due to the
difficulties of manual tracking, especially with the apparant speed
created by the low orbiting rocket (below 200km), there are missing
frames, but measured over the entire sequence, the given time estimation
is most realistic based on the available imaging data.
1.5 second difference between long and short axis view would mean
a rotation (tumbling) period of 6 seconds.
This new animation is made of frames in a much more narrow time span
then the first one (this shows almost one entire rotation in a
time of 2 rotations (due to lost frames) but the effect is equally.
Note that the visible shift (precession) can also partially an
effect of the changing viewing angle during the fast pass:
http://tinyurl.com/2efkd2a
A visible flashing pattern due to tumbling of a rocket seems not
inextricable linked to each other.
In this version of the same animation, you see an intentional decreased
resolution to approach the view as seen with the naked eye (speck-size).
At this way you can see the flashing pattern that would have been
visible for visual observers during that part of the pass. There appear
to be no obvious flashes, more a little irrigular dim flashes:
http://tinyurl.com/28ghd5f
Ralf Vandebergh
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